Skip this single Medicare enrollment step at 65 and the $3,000 penalty doesn’t just sting once — it follows you into retirement for years

Unfortunately, no — and this catches a lot of people off guard. COBRA is not considered ‘creditable coverage’ for Medicare purposes, meaning the clock on your late enrollment penalty keeps ticking while you’re on COBRA. Only coverage tied to active current employment (yours or a spouse’s) through a qualifying employer group plan counts. If you retired at 65 and chose COBRA instead of enrolling in Part B, you could be building toward that $37-per-month permanent surcharge without realizing it.

Yes, and it’s calculated differently than the Part B penalty. For Part D, the penalty is 1% of the national base beneficiary premium multiplied by the number of months you went without creditable drug coverage. In 2026, the base beneficiary premium is set at $36.78 per month, so even 12 months without coverage adds about $4.41 permanently to your monthly Part D premium. While smaller than the Part B hit, it compounds over a long retirement just the same.

You can, but the window is tight. You have 60 days from the date on your penalty notice to file a reconsideration request with the Social Security Administration. You’ll need to submit written documentation proving you had qualifying coverage during the disputed period — things like employer benefits letters or insurance ID cards with active dates. Appeals are handled through the Medicare Appeals Council, and while they don’t always succeed, cases involving clerical errors or employer documentation gaps have been reversed.

The State Health Insurance Assistance Program (SHIP) offers completely free, one-on-one Medicare counseling in every state — no sales pitch, no insurance agent involved. You can reach the national line at 1-800-Medicare (1-800-633-4227) or find your local SHIP office through shiphelp.org. These counselors are trained specifically to walk people through enrollment windows and penalty rules before costly mistakes happen — the kind of guidance that could have prevented a $3,000 cumulative penalty situation entirely.

Yes, and that’s one of the most painful aspects of this rule. Because the penalty is calculated as a percentage of the current standard premium rather than locked to the premium at the time of your late enrollment, it rises with every future premium increase. Starting from the 2026 base of $185 per month, if premiums climb 5% in a future year, your penalty surcharge climbs proportionally with it. For someone already paying an extra $37 per month, even modest annual premium increases can push lifetime penalty costs well past the $3,000 threshold over a 20-year retirement.